// FormChek.js
// 18 Feb 97 created Eric Krock
//
// (c) 1997 Netscape Communications Corporation
//
// VARIABLE DECLARATIONS
var areaCodeLenUSA = 3;

var digits = "0123456789";

var lowercaseLetters = "abcdefghijklmnopqrstuvwxyz"

var uppercaseLetters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

var whitespace = " \t\n\r";

var decimalPointDelimiter = "."

var phoneNumberDelimiters = "()- ";

var validUSPhoneChars = digits + phoneNumberDelimiters;

var validWorldPhoneChars = digits + phoneNumberDelimiters + "+";

var SSNDelimiters = "- ";

var validSSNChars = digits + SSNDelimiters;

var digitsInSocialSecurityNumber = 9;

var digitsInUSPhoneNumber = 10;

var ZIPCodeDelimiters = "-";

var ZIPCodeDelimeter = "-"

var validZIPCodeChars = digits + ZIPCodeDelimiters

var digitsInZIPCode1 = 5
var digitsInZIPCode2 = 9

var creditCardDelimiters = " "

var mPrefix = "You did not enter a value into the "
var mSuffix = " field. This is a required field. Please enter it now."

var sLastName = "Last Name"
var sFirstName = "First Name"
var sEmployer = "Employer"
var sAddress = "Address"
var sCity = "City"
var sStateCode = "State Code"
var sWorldState = "State, or Province"
var sCountry = "Country"
var sZIPCode = "ZIP Code"
var sWorldPostalCode = "Postal Code"
var sResPhone = "Residential Phone Number"
var sBusPhone = "Business Phone Number"
var sFax = "Fax Number"
var sEmail = "Email"
var sDependents = "Dependents"
var sOccupation = "Occupation"
var sTakeHomePay = "Take Home Pay"
var sSpsLastName = "Spouse Last Name"
var sSpsFirstName = "Spouse First Name"
var sSpsEmployer = "Spouse Employer"
var sSpsBusPhone = "Spouse Business Phone Number"
var sSpsOccupation = "Spouse Occupation"
var sSpsTakeHomePay = "Spouse Take Home Pay"

var iStateCode = "This field must be a valid two character U.S. state abbreviation (like CA for California). Please reenter it now."
var iZIPCode = "This field must be a 5 or 9 digit U.S. ZIP Code (like 94043). Please reenter it now."
var	iZIPCode4 = "This field must be 4 digits (like 3489). Please reenter it now."
var iUSPhone = "This field must be a 10 digit U.S. phone number (like 415 555 1212). Please reenter it now."
var iWorldPhone = "This field must be a valid international phone number. Please reenter it now."
var iSSN = "This field must be a 9 digit U.S. social security number (like 123 45 6789). Please reenter it now."
var iEmail = "This field must be a valid email address (like foo@bar.com). Please reenter it now."
var iCreditCardPrefix = "This is not a valid "
var iCreditCardSuffix = " credit card number. (Click the link on this form to see a list of sample numbers.) Please reenter it now."
var iDay = "This field must be a day number between 1 and 31.  Please reenter it now."
var iMonth = "This field must be a month number between 1 and 12.  Please reenter it now."
var iYear = "This field must be a 2 or 4 digit year number.  Please reenter it now."
var iYear4Digit = "This field must be a 4 digit year number.  Please reenter it now."
var iDatePrefix = "The Day, Month, and Year for "
var iDateSuffix = " do not form a valid date.  Please reenter them now."

var pEntryPrompt = "Please enter a "
var pStateCode = "2 character code (like CA)."
var pZIPCode = "5 or 9 digit U.S. ZIP Code (like 94043)."
var pUSPhone = "10 digit U.S. phone number (like 415 555 1212)."
var pWorldPhone = "international phone number."
var pSSN = "9 digit U.S. social security number (like 123 45 6789)."
var pEmail = "valid email address (like foo@bar.com)."
var pCreditCard = "valid credit card number."
var pDay = "day number between 1 and 31."
var pMonth = "month number between 1 and 12."
var pYear = "2 or 4 digit year number."

var defaultEmptyOK = false


function makeArray(n) {
   for (var i = 1; i <= n; i++) {
      this[i] = 0
   } 
   return this
}



var daysInMonth = makeArray(12);
daysInMonth[1] = 31;
daysInMonth[2] = 29;   // must programmatically check this
daysInMonth[3] = 31;
daysInMonth[4] = 30;
daysInMonth[5] = 31;
daysInMonth[6] = 30;
daysInMonth[7] = 31;
daysInMonth[8] = 31;
daysInMonth[9] = 30;
daysInMonth[10] = 31;
daysInMonth[11] = 30;
daysInMonth[12] = 31;



var USStateCodeDelimiter = "|";
var USStateCodes = "AL|AK|AS|AZ|AR|CA|CO|CT|DE|DC|FM|FL|GA|GU|HI|ID|IL|IN|IA|KS|KY|LA|ME|MH|MD|MA|MI|MN|MS|MO|MT|NE|NV|NH|NJ|NM|NY|NC|ND|MP|OH|OK|OR|PW|PA|PR|RI|SC|SD|TN|TX|UT|VT|VI|VA|WA|WV|WI|WY|AE|AA|AE|AE|AP"


function isEmpty(s)
{   return ((s == null) || (s.length == 0))
}


function isWhitespace (s)

{   var i;

    if (isEmpty(s)) return true;

    for (i = 0; i < s.length; i++)
    {   
        var c = s.charAt(i);

        if (whitespace.indexOf(c) == -1) return false;
    }

    return true;
}


function stripCharsInBag (s, bag)

{   var i;
    var returnString = "";

    for (i = 0; i < s.length; i++)
    {   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }

    return returnString;
}


function stripCharsNotInBag (s, bag)

{   var i;
    var returnString = "";

    for (i = 0; i < s.length; i++)
    {   
        var c = s.charAt(i);
        if (bag.indexOf(c) != -1) returnString += c;
    }

    return returnString;
}

function stripWhitespace (s)

{   return stripCharsInBag (s, whitespace)
}

function charInString (c, s)
{   for (i = 0; i < s.length; i++)
    {   if (s.charAt(i) == c) return true;
    }
    return false
}

function stripInitialWhitespace (s)

{   var i = 0;

    while ((i < s.length) && charInString (s.charAt(i), whitespace))
       i++;
    
    return s.substring (i, s.length);
}

function isLetter (c)
{   return ( ((c >= "a") && (c <= "z")) || ((c >= "A") && (c <= "Z")) )
}

function isDigit (c)
{   return ((c >= "0") && (c <= "9"))
}

function isLetterOrDigit (c)
{   return (isLetter(c) || isDigit(c))
}

function isInteger (s)

{   var i;

    if (isEmpty(s)) 
       if (isInteger.arguments.length == 1) return defaultEmptyOK;
       else return (isInteger.arguments[1] == true);

    for (i = 0; i < s.length; i++)
    {   
        var c = s.charAt(i);

        if (!isDigit(c)) return false;
    }

    return true;
}

function isSignedInteger (s)

{   if (isEmpty(s)) 
       if (isSignedInteger.arguments.length == 1) return defaultEmptyOK;
       else return (isSignedInteger.arguments[1] == true);

    else {
        var startPos = 0;
        var secondArg = defaultEmptyOK;

        if (isSignedInteger.arguments.length > 1)
            secondArg = isSignedInteger.arguments[1];

        if ( (s.charAt(0) == "-") || (s.charAt(0) == "+") )
           startPos = 1;    
        return (isInteger(s.substring(startPos, s.length), secondArg))
    }
}

function isPositiveInteger (s)
{   var secondArg = defaultEmptyOK;

    if (isPositiveInteger.arguments.length > 1)
        secondArg = isPositiveInteger.arguments[1];

    return (isSignedInteger(s, secondArg)
         && ( (isEmpty(s) && secondArg)  || (parseInt (s) > 0) ) );
}

function isNonnegativeInteger (s)
{   var secondArg = defaultEmptyOK;

    if (isNonnegativeInteger.arguments.length > 1)
        secondArg = isNonnegativeInteger.arguments[1];

    return (isSignedInteger(s, secondArg)
         && ( (isEmpty(s) && secondArg)  || (parseInt (s) >= 0) ) );
}

function isNegativeInteger (s)
{   var secondArg = defaultEmptyOK;

    if (isNegativeInteger.arguments.length > 1)
        secondArg = isNegativeInteger.arguments[1];

    return (isSignedInteger(s, secondArg)
         && ( (isEmpty(s) && secondArg)  || (parseInt (s) < 0) ) );
}

function isNonpositiveInteger (s)
{   var secondArg = defaultEmptyOK;

    if (isNonpositiveInteger.arguments.length > 1)
        secondArg = isNonpositiveInteger.arguments[1];

    return (isSignedInteger(s, secondArg)
         && ( (isEmpty(s) && secondArg)  || (parseInt (s) <= 0) ) );
}

function isFloat (s)

{   var i;
    var seenDecimalPoint = false;

    if (isEmpty(s)) 
       if (isFloat.arguments.length == 1) return defaultEmptyOK;
       else return (isFloat.arguments[1] == true);

    if (s == decimalPointDelimiter) return false;


    for (i = 0; i < s.length; i++)
    {   
        var c = s.charAt(i);

        if ((c == decimalPointDelimiter) && !seenDecimalPoint) seenDecimalPoint = true;
        else if (!isDigit(c)) return false;
    }

    return true;
}

function isSignedFloat (s)

{   if (isEmpty(s)) 
       if (isSignedFloat.arguments.length == 1) return defaultEmptyOK;
       else return (isSignedFloat.arguments[1] == true);

    else {
        var startPos = 0;
        var secondArg = defaultEmptyOK;

        if (isSignedFloat.arguments.length > 1)
            secondArg = isSignedFloat.arguments[1];

        if ( (s.charAt(0) == "-") || (s.charAt(0) == "+") )
           startPos = 1;    
        return (isFloat(s.substring(startPos, s.length), secondArg))
    }
}

function isAlphabetic (s)

{   var i;

    if (isEmpty(s)) 
       if (isAlphabetic.arguments.length == 1) return defaultEmptyOK;
       else return (isAlphabetic.arguments[1] == true);

    for (i = 0; i < s.length; i++)
    {   
        var c = s.charAt(i);

        if (!isLetter(c))
        return false;
    }

    return true;
}

function isAlphanumeric (s)

{   var i;

    if (isEmpty(s)) 
       if (isAlphanumeric.arguments.length == 1) return defaultEmptyOK;
       else return (isAlphanumeric.arguments[1] == true);

    for (i = 0; i < s.length; i++)
    {   
        var c = s.charAt(i);

        if (! (isLetter(c) || isDigit(c) ) )
        return false;
    }

    return true;
}

function reformat (s)

{   var arg;
    var sPos = 0;
    var resultString = "";

    for (var i = 1; i < reformat.arguments.length; i++) {
       arg = reformat.arguments[i];
       if (i % 2 == 1) resultString += arg;
       else {
           resultString += s.substring(sPos, sPos + arg);
           sPos += arg;
       }
    }
    return resultString;
}

function isWeekend(date)
{
	if (date != null)
	{
		/*
		*	Sunday=0,Monday=1,Tuesday=2,Wednsday=3,Thursday=4,Friday=5,Saturday=6;
		*/
		var dayOfWeek = date.getDay();
		return (dayOfWeek == 0 || dayOfWeek == 6); 
	}
	
	return false;	
}


function isSSN (s)
{   if (isEmpty(s)) 
       if (isSSN.arguments.length == 1) return defaultEmptyOK;
       else return (isSSN.arguments[1] == true);
    return (isInteger(s) && s.length == digitsInSocialSecurityNumber)
}

function isUSPhoneNumber (s)
{   if (isEmpty(s)) 
       if (isUSPhoneNumber.arguments.length == 1) return defaultEmptyOK;
       else return (isUSPhoneNumber.arguments[1] == true);
    return (isInteger(s) && s.length == digitsInUSPhoneNumber)
}

function isInternationalPhoneNumber (s)
{   if (isEmpty(s)) 
       if (isInternationalPhoneNumber.arguments.length == 1) return defaultEmptyOK;
       else return (isInternationalPhoneNumber.arguments[1] == true);
    return (isPositiveInteger(s))
}

function isZIPCode (s)
{  if (isEmpty(s)) 
       if (isZIPCode.arguments.length == 1) return defaultEmptyOK;
       else return (isZIPCode.arguments[1] == true);
   return (isInteger(s) && 
            ((s.length == digitsInZIPCode1) ||
             (s.length == digitsInZIPCode2)))
}


function isStateCode(s)
{   if (isEmpty(s)) 
       if (isStateCode.arguments.length == 1) return defaultEmptyOK;
       else return (isStateCode.arguments[1] == true);
    return ( (USStateCodes.indexOf(s) != -1) &&
             (s.indexOf(USStateCodeDelimiter) == -1) )
}

function isEmail(s)
{
	if (isWhitespace(s)) 
		return false;
	
	//var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i;
	var filter=/^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/i;
	if (filter.test(s))
		return true;
	else
		return false;
}

function isYear (s)
{   if (isEmpty(s)) 
       if (isYear.arguments.length == 1) return defaultEmptyOK;
       else return (isYear.arguments[1] == true);
    if (!isNonnegativeInteger(s)) return false;
    return ((s.length == 2) || (s.length == 4));
}

function isYear4Digit (s)
{   if (isEmpty(s)) 
       if (isYear4Digit.arguments.length == 1) return defaultEmptyOK;
       else return (isYear4Digit.arguments[1] == true);
    if (!isNonnegativeInteger(s)) return false;
    return (s.length == 4);
}

function isIntegerInRange (s, a, b)
{   if (isEmpty(s)) 
       if (isIntegerInRange.arguments.length == 1) return defaultEmptyOK;
       else return (isIntegerInRange.arguments[1] == true);

    if (!isInteger(s, false)) return false;

    var num = parseInt (s);
    return ((num >= a) && (num <= b));
}

function isMonth (s)
{   if (isEmpty(s)) 
       if (isMonth.arguments.length == 1) return defaultEmptyOK;
       else return (isMonth.arguments[1] == true);
    if (s.charAt(0) == "0")
		s = s.substr(1);
		
    return isIntegerInRange (s, 1, 12);
}

function isDay (s)
{   if (isEmpty(s)) 
       if (isDay.arguments.length == 1) return defaultEmptyOK;
       else return (isDay.arguments[1] == true);   
    
    if (s.charAt(0) == "0")
		s = s.substr(1);
    return isIntegerInRange (s, 1, 31);
}


function daysInFebruary (year)
{
   return (  ((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0) ) ) ? 29 : 28 );
}


function isDate (year, month, day)
{   if (! (isYear(year, false) && isMonth(month, false) && isDay(day, false))) return false;

    var intYear = parseInt(year);
    var intMonth = parseInt(month);
    var intDay = parseInt(day);

    if (intDay > daysInMonth[intMonth]) return false; 

    if ((intMonth == 2) && (intDay > daysInFebruary(intYear))) return false;

    return true;
}

function prompt (s)
{   window.status = s
}

function promptEntry (s)
{   window.status = pEntryPrompt + s
}

function warnEmpty (theField, s)
{   theField.focus()
    alert(mPrefix + s + mSuffix)
    return false
}

function warnUnchecked (radio, s)
{
	var mPrefix = "You did not choose a selection for the "
	var mSuffix = " radio button. This is a required field. Please enter it now."
	radio[0].focus();
	alert(mPrefix + s + mSuffix);
	return false;
}

function warnInvalid (theField, s)
{   theField.focus()
    theField.select()
    alert(s)
    return false
}

function warnInvalidNoSelect (theField, s)
{   theField.focus()
    alert(s)
    return false
}


function checkString (theField, s, emptyOK)
{
   if (checkString.arguments.length == 2) emptyOK = defaultEmptyOK;
    if ((emptyOK == true) && (isEmpty(theField.value))) return true;
    if (isWhitespace(theField.value)) 
       return warnEmpty (theField, s);
    else return true;
}

// Check to see that a string is non-whitespace and is not entirely numeric
function checkNonNumeric (theField, s, emptyOK)
{
	if (checkNonNumeric.arguments.length == 2) 
		emptyOK = defaultEmptyOK;
	if ((emptyOK == true) && (isEmpty(theField.value))) 
		return true;
    if (isWhitespace(theField.value)) 
       return warnEmpty (theField, s);
    if (isInteger(theField.value))
	{
		s += " is invalid.  A number value is not allowed for this field.";
		return warnInvalid (theField, s);
	}	

    return true;
}

function checkPersonName (theField, s, emptyOK)
{
	if (checkPersonName.arguments.length == 2) 
		emptyOK = defaultEmptyOK;
	if ((emptyOK == true) && (isEmpty(theField.value))) 
		return true;
    if (isWhitespace(theField.value)) 
       return warnEmpty (theField, s);
    
    var i;
    var val = theField.value;
    val = stripCharsInBag (val, " -'\t");
    for (i = 0; i < val.length; i++)
    {   
	  var c = val.charAt(i);
	   if (!isLetter(c)) 
        {
			s += " is invalid.  Please enter only letters of the alphabet for this field.";
			return warnInvalid (theField, s);
		}
    }

    return true;
}

function checkWeekday(theField, month, day, year, s, emptyOK)
{
	if (checkWeekday.arguments.length == 5) 
		emptyOK = defaultEmptyOK;
	
	var month;
	if (month != null && !isNaN(month))
		month -= 1;
		   
    var date = new Date(year, month, day);
    if (date != null)
    {
		if ( isWeekend(date) )
		{
			s += " is invalid.  Please enter a date that is not a weekend.";
			return warnInvalidNoSelect (theField, s);
		}
    }
    return true;
}

function checkCity(theField, s, emptyOK)
{
	if (checkCity.arguments.length == 2) 
		emptyOK = defaultEmptyOK;
	if ((emptyOK == true) && (isEmpty(theField.value))) 
		return true;
    if (isWhitespace(theField.value)) 
       return warnEmpty (theField, s);
    
    var i;
    var val = theField.value;
    val = stripCharsInBag (val, " -'\t");
    for (i = 0; i < val.length; i++)
    {   
	  var c = val.charAt(i);
	   if (!isLetter(c)) 
        {
			s += " is invalid.  Please enter only letters of the alphabet for this field.";
			return warnInvalid (theField, s);
		}
    }

    return true;
}

function checkAreaCode (theField, s, emptyOK)
{
   if (checkAreaCode.arguments.length == 2) emptyOK = defaultEmptyOK;
    if ((emptyOK == true) && (isEmpty(theField.value))) return true;
    if (isWhitespace(theField.value)) 
       return warnEmpty (theField, s);
       
    var strVal = new String(theField.value);
	if (!isInteger(strVal)) 
		return warnInvalid (theField, "Please enter a valid numeric value for " + s);
	else if (strVal.length != areaCodeLenUSA)
	{
		return warnInvalid (theField, "Please enter " + areaCodeLenUSA + " numeric characters for " + s);
	}
	else if (strVal.charAt(0) == '0' || strVal.charAt(0) == '1')
		return warnInvalid (theField, "Please enter a valid value for " + s);
	else if (strVal == "555" || strVal == "999")
		return warnInvalid (theField, "Please enter a valid value for " + s);
	else
	{
		return true;
	}
}

function checkDropdown(theField, s, emptyOK) 
	{
    	if (checkDropdown.arguments.length == 2) 
    		emptyOK = defaultEmptyOK;
    	var choice = 0;
    	choice = theField.selectedIndex;
    	
    	if ( (emptyOK == true) && (choice == 0) ) 
    		return true;
    	if ( choice == 0 ) 
       	return warnEmpty (theField, s);
    	else return true;
   
	}

function checkCurrency(theField, s, emptyOK)
{
	if (checkCurrency.arguments.length == 2) 
		emptyOK = defaultEmptyOK;
	if ((emptyOK == true) && (isEmpty(theField.value))) 
		return true;
	var stripped
	stripped = stripCharsInBag(theField.value, "$,")
	if (!isFloat(stripped)) 
		return warnInvalid (theField, "Please enter a valid currency value for " + s);
	else
	{
		theField.value = stripped; 
		return true;
	}
}

function checkNumeric(theField, s, emptyOK)
{
	if (checkNumeric.arguments.length == 2) 
		emptyOK = defaultEmptyOK;
	if ((emptyOK == true) && (isEmpty(theField.value))) 
		return true;
	if (!isInteger(theField.value)) 
		return warnInvalid (theField, "Please enter a valid numeric value for " + s);
	else
	{
		return true;
	}
}

function checkNumericLength(theField, s, len, emptyOK)
{
	if (checkNumericLength.arguments.length == 3) 
		emptyOK = defaultEmptyOK;
	if ((emptyOK == true) && (isEmpty(theField.value))) 
		return true;
	var strVal = new String(theField.value);
	if (!isInteger(strVal)) 
		return warnInvalid (theField, "Please enter a valid numeric value for " + s);
	else if (strVal.length != len)
	{
		return warnInvalid (theField, "Please enter " + len + " numeric characters for " + s);
	}
	else
	{
		return true;
	}
}

function checkNumericIgnoreWhitespace(theField, s, emptyOK)
{
	if (checkNumericIgnoreWhitespace.arguments.length == 2) 
		emptyOK = defaultEmptyOK;
	if ((emptyOK == true) && (isEmpty(theField.value))) 
		return true;
	var n = theField.value;
	n = stripWhitespace(n);
	if (!isInteger(n)) 
		return warnInvalid (theField, "Please enter a valid numeric value for " + s);
	else
	{
		return true;
	}
}

function checkSelected(theField, s, emptyOK)
	{
    	if (checkSelected.arguments.length == 2) 
    		emptyOK = defaultEmptyOK;
    	var iIndex;
    	iIndex = parseInt( theField.selectedIndex );
    	if ( emptyOK == true ) //&& iIndex > 0) 
    		return true;
    	if (iIndex == 0) 
    	{
    		return warnEmpty (theField, s);
       	}
    	else return true;
	}

function checkStateCode (theField, emptyOK)
{   if (checkStateCode.arguments.length == 1) emptyOK = defaultEmptyOK;
    if ((emptyOK == true) && (isEmpty(theField.value))) return true;
    else
    {  theField.value = theField.value.toUpperCase();
       if (!isStateCode(theField.value, false)) 
          return warnInvalid (theField, iStateCode);
       else return true;
    }
}


function reformatZIPCode (ZIPString)
{   if (ZIPString.length == 5) return ZIPString;
    else return (reformat (ZIPString, "", 5, "-", 4));
}

function checkZIPCode (theField, emptyOK)
{   if (checkZIPCode.arguments.length == 1) emptyOK = defaultEmptyOK;
    if ((emptyOK == true) && (isEmpty(theField.value))) return true;
    else
    { var normalizedZIP = stripCharsInBag(theField.value, ZIPCodeDelimiters)
      if (!isZIPCode(normalizedZIP, false)) 
         return warnInvalid (theField, iZIPCode);
      else 
      {
               return true;
      }
    }
}

function checkZIPCode4 (theField, emptyOK)
{   if (checkZIPCode4.arguments.length == 1) emptyOK = defaultEmptyOK;
    if ((emptyOK == true) && (isEmpty(theField.value))) return true;
    else
    { 
		var strValue = new String(theField.value)
		if (!isInteger(strValue) || strValue.length != 4)
			return warnInvalid(theField, iZIPCode4);
		else
			return true;
    }
}

function reformatUSPhone (USPhone)
{
	return (reformat (USPhone, "", 3, "-", 3, "-", 4))
}



function checkUSPhone (theField, emptyOK)
{   if (checkUSPhone.arguments.length == 1) emptyOK = defaultEmptyOK;
    if ((emptyOK == true) && (isEmpty(theField.value))) return true;
    else
    {  var normalizedPhone = stripCharsInBag(theField.value, phoneNumberDelimiters)
       if (!isUSPhoneNumber(normalizedPhone, false)) 
          return warnInvalid (theField, iUSPhone);
       else 
       {
          theField.value = reformatUSPhone(normalizedPhone)
          return true;
       }
    }
}


function checkInternationalPhone (theField, emptyOK)
{   if (checkInternationalPhone.arguments.length == 1) emptyOK = defaultEmptyOK;
    if ((emptyOK == true) && (isEmpty(theField.value))) return true;
    else
    {  if (!isInternationalPhoneNumber(theField.value, false)) 
          return warnInvalid (theField, iWorldPhone);
       else return true;
    }
}


function checkEmail (theField, emptyOK)
{   if (checkEmail.arguments.length == 1) emptyOK = defaultEmptyOK;
    if ((emptyOK == true) && (isEmpty(theField.value))) return true;
    else if (!isEmail(theField.value, false)) 
       return warnInvalid (theField, iEmail);
    else return true;
}


function reformatSSN (SSN)
{   return (reformat (SSN, "", 3, "-", 2, "-", 4))
}


function checkSSN (theField, emptyOK)
{   if (checkSSN.arguments.length == 1) emptyOK = defaultEmptyOK;
    if ((emptyOK == true) && (isEmpty(theField.value))) return true;
    else
    {  var normalizedSSN = stripCharsInBag(theField.value, SSNDelimiters)
       if (!isSSN(normalizedSSN, false)) 
          return warnInvalid (theField, iSSN);
       else 
       {  // if you don't want to reformats as 123-456-7890, comment next line out
          theField.value = reformatSSN(normalizedSSN)
          return true;
       }
    }
}

function checkYear (theField, emptyOK)
{   if (checkYear.arguments.length == 1) emptyOK = defaultEmptyOK;
    if ((emptyOK == true) && (isEmpty(theField.value))) return true;
    if (!isYear(theField.value, false)) 
       return warnInvalid (theField, iYear);
    else return true;
}

function checkYear4Digit (theField, emptyOK)
{   if (checkYear4Digit.arguments.length == 1) emptyOK = defaultEmptyOK;
    if ((emptyOK == true) && (isEmpty(theField.value))) return true;
    if (!isYear4Digit(theField.value, false)) 
       return warnInvalid (theField, iYear4Digit);
    else return true;
}

function checkMonth (theField, emptyOK, zeroOK)
{   if (checkMonth.arguments.length == 1) emptyOK = defaultEmptyOK;
	if (checkMonth.arguments.length == 2) zeroOK = false;
    if ((emptyOK == true) && (isEmpty(theField.value))) return true;
    if (zeroOK == true && theField.value == "0")
		return true;
    if (!isMonth(theField.value, false)) 
       return warnInvalid (theField, iMonth);
    else return true;
}

function checkDay (theField, emptyOK)
{   if (checkDay.arguments.length == 1) emptyOK = defaultEmptyOK;
    if ((emptyOK == true) && (isEmpty(theField.value))) return true;
    if (!isDay(theField.value, false)) 
       return warnInvalid (theField, iDay);
    else return true;
}

function checkDate (yearField, monthField, dayField, labelString, OKtoOmitDay)
{   // Next line is needed on NN3 to avoid "undefined is not a number" error
    // in equality comparison below.
    if (checkDate.arguments.length == 4) OKtoOmitDay = false;
    if (!isYear(yearField.value)) return warnInvalid (yearField, iYear);
    if (!isMonth(monthField.value)) return warnInvalid (monthField, iMonth);
    if ( (OKtoOmitDay == true) && isEmpty(dayField.value) ) return true;
    else if (!isDay(dayField.value)) 
       return warnInvalid (dayField, iDay);
    if (isDate (yearField.value, monthField.value, dayField.value))
       return true;
    alert (iDatePrefix + labelString + iDateSuffix)
    return false
}

function checkRadioButtonChecked(radio, s, emptyOK)
{
	if (checkRadioButtonChecked.arguments.length == 2) 
		emptyOK = defaultEmptyOK;
	
	for (var i = 0; i < radio.length; i++)
	{   
		if (radio[i].checked) 
		{ 
			return true; 
		}
    }

	if (emptyOK == true)
		return true;
	
	return warnUnchecked (radio, s);
}

function checkString (theField, s, emptyOK)
{
 
    if (checkString.arguments.length == 2) emptyOK = defaultEmptyOK;
    if ((emptyOK == true) && (isEmpty(theField.value))) return true;
    if (isWhitespace(theField.value)) 
       return warnEmpty (theField, s);
    else return true;
}

function getRadioButtonValue (radio)
{   for (var i = 0; i < radio.length; i++)
    {   if (radio[i].checked) { break }
    }
    return radio[i].value
}